Why do people have this mentality? If you are residing together with children, then it's a family.
If you look up the definition of family, here's what you get:
a. A fundamental social group in society typically consisting of one or two parents and their children.
b. Two or more people who share goals and values, have long-term commitments to one another, and reside usually in the same dwelling place.
2. All the members of a household under one roof.
3. A group of persons sharing common ancestry. See Usage Note at collective noun.
Why are people so concerned with how others live their life?